Fwd: Re: [sdiy] Diode Matrix Keyboard Circuits?

[klosmon]

OK -- scanned the DAC article (3 pages):
http://www.analogsynthservice.com/aux3.html
I also tacked on the layout for the keyboard encoder;  but since you're 
probably not going to be using this to build the Paia system, I would 
suggest building both circuits on the same board, to simplify wiring & 
interconnection.
Also, disregard the Paia QuASH connections.

~G


>Date: Thu, 07 Dec 2006 12:25:11 -0800
>To: "DSL FODA01" <foda01 at epix.net>
>From: klosmon <klosmon at sbcglobal.net>
>Subject: Re: [sdiy] Diode Matrix Keyboard Circuits?
>Cc: synth-diy at dropmix.xs4all.nl
>
>That's the one.  It's pretty simple, and uses standard CMOS chips.
>The data output needs to go into a DAC;  he also had a nice (cheap) 1 
>volt/octave DAC circuit that went with it.  I'll see if I can dig it up & 
>scan it.
>
>~G
>At 12:06 PM 12/7/2006, you wrote:
>>Hi G,
>>
>>Thanks for the reference.  I couldn't find anything on that source, but I
>>did find this:
>>http://neolase.lasers.org/PAiA/8782/schematic.htm
>>Is this something similar?  It looks like it's part of a larger system - I'm
>>not sure if it could be operated as a stand-alone.  Hmmm....
>>
>>Dave
>>
>>
>>----- Original Message -----
>>From: "klosmon" <klosmon at sbcglobal.net>
>>To: "DSL FODA01" <foda01 at epix.net>
>>Cc: <synth-diy at dropmix.xs4all.nl>
>>Sent: Thursday, December 07, 2006 1:38 PM
>>Subject: Re: [sdiy] Diode Matrix Keyboard Circuits?
>>
>>
>> > One of the simplest I've seen is the old Paia diode encoded keyboard --
>> > details were in "Friendly Stories about Computers & Synthesizers" by John
>> > Simonton.
>> >
>> > ~G
>> > At 09:51 AM 12/7/2006, you wrote:
>> > >Hello Harald,
>> > >
>> > >Thank you for the reference.  I took a look at that web page, but I had a
>> > >hard time understanding it, even using an online translation program
>> > >(Babelfish).  From what I could understand, it seems to me as though they
>> > >are working with MIDI.  I am looking for a way to bypass MIDI altogether
>>and
>> > >go right from a matrix-keyboard to CV/Gate/Trigger output.  If I am
>> > >mistaken, please let me know.  I have a 16F877A which could give analog
>> > >outputs via PWM but I have yet to learn how to program it ;-)
>> > >
>> > >thanks sincerely,
>> > >
>> > >Dave
>> > >
>> > >
>> > >----- Original Message -----
>> > >From: <HA.Synth at t-online.de>
>> > >To: "DSL FODA01" <foda01 at epix.net>; "Synth DIY"
>> > ><synth-diy at dropmix.xs4all.nl>
>> > >Sent: Thursday, December 07, 2006 10:44 AM
>> > >Subject: Re: [sdiy] Diode Matrix Keyboard Circuits?
>> > >
>> > >
>> > > > Hi Dave,
>> > > >
>> > > > look at this: http://www.heise.de/ct/Redaktion/cm/klangcomputer/
>> > > > Sorry its German, but they sell the PCBs you need and you can download
>>the
>> > > > firmware there.
>> > > >
>> > > > Harald
>> > > >
>> > > >
>> > > > Am Donnerstag, 7. Dezember 2006 04:56 schrieb DSL FODA01:
>> > > > > Hi all,
>> > > > >
>> > > > > Does anyone here know of a good way to create a scanner circuit for
>>a
>> > >diode
>> > > > > matrix keyboard?  I have a 49 key Yamaha keyboard here that already
>>has
>> > >a
>> > > > > diode matrix type of board on it and I would like to use it to
>>generate
>> > > > > CV/Trig/Gate outputs.  I think a PIC or something like that would be
>> > >best
>> > > > > but unfortunately I don't yet have a high enough skill at low-level
>> > > > > programming.  I have seen some designs in hardware, but the only
>>board I
>> > > > > saw (Ray Wilson's) is discontinued.  Any other suggestions?
>> > > > >
>> > > > > Dave
>> > > >
>> >
>> >
>> >